<html>
<head>
	<title>登录</title>
	<meta charset="utf8">
</head>
<body>
	<form onsubmit="return sub()">
	<p>
	账号：<input type="text" name="dl" id="dl" onblur="check()"><span id="check"></span><br>
	密码：<input type="password" name="mm"><br>
	<input type="submit">
	</p>
	</form>
</body>
</html>